本文關(guān)鍵詞： 高動態(tài) 微振動 多普勒 擴頻 臨近空間　出處：《西安電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,臨近空間通信技術(shù)發(fā)展迅速。臨近空間通信能夠為地面和飛行載體提供多項通信業(yè)務(wù)服務(wù),而針對臨近空間超高速飛行器測控通信也成為了重點研究領(lǐng)域之一。臨近空間中的飛行載體具有高動態(tài)性,導(dǎo)致該環(huán)境下的通信情況與其他環(huán)境相差很大。在工程實測中發(fā)現(xiàn),飛行器在非黑障區(qū)飛行時也會出現(xiàn)短時間的通信閃斷現(xiàn)象,且該現(xiàn)象在飛行器的各個航段均有出現(xiàn)。經(jīng)初步分析,排除雨衰等一些對通信的影響因素后,發(fā)現(xiàn)飛行器各類機械轉(zhuǎn)動、飛行器可控件驅(qū)動機構(gòu)工作和空氣動力等會誘發(fā)飛行器產(chǎn)生一種頻率較高的振動,這種振動的幅度約為厘米級,和Ka波段的電磁波波長相近,因此這種振動將導(dǎo)致一定程度的多普勒頻移。本文旨在研究飛行器載體局部級別的振動對Ka測控通信系統(tǒng)的同步性能以及誤碼性能影響,揭示其對測控通信同步捕獲跟蹤環(huán)路的影響機理。主要工作包括:1.對Ka波段擴頻測控系統(tǒng)結(jié)構(gòu)和相關(guān)技術(shù)的基本原理進行闡述;簡介多普勒頻偏的產(chǎn)生原理、臨近空間通信特點和測控通信系統(tǒng)分類。2.分別從捕獲階段和跟蹤階段兩個方面,討論了擴頻系統(tǒng)中同步技術(shù)。首先介紹了幾種同步捕獲技術(shù),其中著重對基于FFT的快速捕獲算法原理進行了闡述并完成了仿真分析。其次,分別對跟蹤同步技術(shù)中鎖相環(huán)、鎖頻環(huán)的主要組成部分進行介紹和性能仿真。3.簡介了微動概念,從一般微動建模分析著手,針對微振動進行了物理建模,并進一步完成了振動誘導(dǎo)的多普勒頻率建模。利用模型詳細(xì)分析了振動誘導(dǎo)的多普勒特點。4.在振動多普勒建模的基礎(chǔ)上,結(jié)合飛行器高速特點,建立兩種高動態(tài)多普勒效應(yīng)模型:勻速運動振動多普勒以及加速運動振動多普勒。利用仿真實驗?zāi)MKa波段擴頻測控系統(tǒng)在這兩種物理模型情況下的通信,分析了擴頻測控系統(tǒng)的同步性能以及誤碼性能。仿真結(jié)果證明,高頻率的振動多普勒影響了擴頻測控系統(tǒng)的跟蹤同步性能。
[Abstract]:In recent years, Near-Space Communications Technology has developed rapidly. Near-Space Communications can provide multiple communications services for ground and flight carriers, For the near space super high speed vehicle TT & C communication has also become one of the key research fields. The flight carrier in the near space has a high dynamic property, which leads to a great difference between the communication situation in this environment and other environments. Flying in the non-black barrier area, the aircraft will also have a short communication flash phenomenon, and this phenomenon will occur in all segments of the aircraft. After preliminary analysis, some factors affecting the communication, such as rain decline, are excluded. It is found that various kinds of mechanical rotation of the aircraft, the control of the driving mechanism and the aerodynamic force of the aircraft can induce the aircraft to produce a vibration of higher frequency. The amplitude of the vibration is about centimeter, which is similar to the wavelength of the electromagnetic wave in Ka band. Therefore, this kind of vibration will lead to a certain degree of Doppler frequency shift. This paper aims to study the effects of local vibration of aircraft carrier on synchronization performance and error rate performance of Ka TT & C communication system. The main work includes: 1. Expound the structure of Ka-band spread spectrum measurement and control system and the basic principle of related technology, introduce the generation principle of Doppler frequency offset, The characteristics of near space communication and the classification of TT & C communication system. 2. The synchronization technology in spread spectrum system is discussed from two aspects: acquisition stage and tracking stage. Firstly, several synchronization acquisition techniques are introduced. The principle of fast acquisition algorithm based on FFT is expatiated and simulated. Secondly, the main components of phase-locked loop and frequency-locked loop in tracking synchronization technology are introduced and the performance simulation is given. 3. The concept of micro-motion is introduced briefly. Based on the analysis of general fretting modeling, the physical modeling of microvibration is carried out. Furthermore, the Doppler frequency modeling of vibration induction is completed. The Doppler characteristics of vibration induction are analyzed in detail by using the model. Based on the Doppler vibration modeling, the characteristics of high speed vehicle are combined. Two kinds of high dynamic Doppler effect models are established: uniform moving vibration Doppler and accelerating moving vibration Doppler. The communication of Ka-band spread spectrum measurement and control system under these two physical models is simulated by simulation experiments. The synchronization performance and error rate performance of the spread spectrum measurement and control system are analyzed. The simulation results show that the high frequency vibration Doppler affects the tracking synchronization performance of the spread spectrum measurement and control system.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN914.42

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